import java.util.concurrent.locks.ReentrantLock;

public class ReentrantLockDemo1 {
    private static int total = 0;
    public static void main(String[] args) throws InterruptedException {
        ReentrantLock locker = new ReentrantLock();
        Thread t1 = new Thread(() -> {
            for (int i = 0; i < 50000; i++) {
                locker.lock();
                try{
                    total++;
                }finally {
                    locker.unlock();
                }
            }
        });
        Thread t2 = new Thread(() -> {
            for (int i = 0; i < 50000; i++) {
                locker.lock();
                try{
                    total++;
                }finally {
                    locker.unlock();
                }
            }
        });
        t1.start();
        t2.start();
        t1.join();
        t2.join();
        System.out.println(total);
    }
}
